/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * libc/misc/lib_stream.c
 *
 *   Copyright (C) 2007, 2011, 2013-2014 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>

#include <stdio.h>
#include <string.h>
#include <errno.h>

#include <tinyara/kmalloc.h>
#include <tinyara/sched.h>
#include <tinyara/fs/fs.h>
#include <tinyara/lib.h>

#include "lib_internal.h"

#if (!defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL)) || \
	  defined(__KERNEL__)

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Variables
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: lib_stream_initialize
 *
 * Description:
 *   This function is called when a new task is allocated.  It initializes
 *   the streamlist instance that is stored in the task group.
 *
 ****************************************************************************/

#if CONFIG_NFILE_STREAMS > 0
void lib_stream_initialize(FAR struct task_group_s *group)
{
	FAR struct streamlist *list;
	int i;

#if (defined(CONFIG_BUILD_PROTECTED) || defined(CONFIG_BUILD_KERNEL)) && \
	 defined(CONFIG_MM_KERNEL_HEAP)
	DEBUGASSERT(group && group->tg_streamlist);
	list = group->tg_streamlist;
#else
	DEBUGASSERT(group);
	list = &group->tg_streamlist;
#endif

	/* Initialize the list access mutex */

	(void)sem_init(&list->sl_sem, 0, 1);

	/* Initialize each FILE structure */

	for (i = 0; i < CONFIG_NFILE_STREAMS; i++) {

		FAR struct file_struct *stream = &list->sl_streams[i];

		/* Clear the IOB */

		memset(stream, 0, sizeof(FILE));

		/* Indicate not opened */

		stream->fs_fd = -1;

		/* Initialize the stream semaphore to one to support one-at-
		 * a-time access to private data sets.
		 */

		lib_sem_initialize(&list->sl_streams[i]);
	}
}
#endif							/* CONFIG_NFILE_STREAMS > 0 */

/****************************************************************************
 * Name: lib_stream_init
 *
 * Description:
 *   This function is called when a TCB is destroyed.  Note that it does not
 *   close the files by releasing the inode.  That happens separately when
 *   the file descriptor list is freed.
 *
 ****************************************************************************/

#if CONFIG_NFILE_STREAMS > 0
void lib_stream_release(FAR struct task_group_s *group)
{
	FAR struct streamlist *list;
#if CONFIG_STDIO_BUFFER_SIZE > 0
	int i;
#endif

#if (defined(CONFIG_BUILD_PROTECTED) || defined(CONFIG_BUILD_KERNEL)) && \
	 defined(CONFIG_MM_KERNEL_HEAP)
	DEBUGASSERT(group && group->tg_streamlist);
	list = group->tg_streamlist;
#else
	DEBUGASSERT(group);
	list = &group->tg_streamlist;
#endif

	/* Destroy the semaphore and release the filelist */

	(void)sem_destroy(&list->sl_sem);

	/* Release each stream in the list */

#if CONFIG_STDIO_BUFFER_SIZE > 0
	for (i = 0; i < CONFIG_NFILE_STREAMS; i++) {

		FAR struct file_struct *stream = &list->sl_streams[i];

		/* Destroy the semaphore that protects the IO buffer */

		(void)sem_destroy(&stream->fs_sem);

		/* Release the IO buffer */

		if (stream->fs_bufstart != NULL && (stream->fs_flags & __FS_FLAG_UBF) == 0) {
#ifndef CONFIG_BUILD_KERNEL
			/* Release memory appropriate previously allocated via group_malloc()
			 * using the appropriate memory manager.
			 */

			group_free(group, stream->fs_bufstart);
#else
			/* If the exiting group is unprivileged, then it has an address
			 * environment.  Don't bother to release the memory in this case...
			 * There is no point since the memory lies in the user heap which
			 * will be destroyed anyway.  But if this is a privileged group,
			 * when we still have to release the memory using the kernel
			 * allocator.
			 */

			if ((group->tg_flags & GROUP_FLAG_PRIVILEGED) != 0) {
				sched_kfree(stream->fs_bufstart);
			}
#endif
		}
	}
#endif
}
#endif							/* CONFIG_NFILE_STREAMS > 0 */

#endif							/* (!CONFIG_BUILD_PROTECTED &&7 !CONFIG_BUILD_KERNEL) || __KERNEL__ */
